View Full Version : FJR Fixed

June 2nd, 2006, 08:20 AM
UPDATE: Got the bike back the first time on May 7th. They let me have it back while waiting on 2 more parts to come in, an O2 sensor and fuel pressure regulator. I took it back on May 19th when the parts came in. I went back several times over that 2 week period to check on the bike's status. Alas, they've been selling new units like hotcakes which were being prepped ahead of the FJR. I got a call from the Service Manager on May 31st, in the evening that they'd buttoned it back up after installing the new parts the idle still didn't want to adjust below 1400 rpms, just like when I'd picked it up on the 7th. He said they wanted to keep it one more day and check for carbon buildup on the throttle bodies.
Pics of throttle bodies plus a pic of a motor mount bolt just barely hanging on.


I had been running nothing but 87 octane (Exxon) and about every 5000 miles or so a little fuel injector cleaner. I'm switching to premium after seeing this excessive carbon buildup. The bike runs like a champ after the throttle bodies were cleaned. Idle back to normal. It was put on the dyno afterwards and I'll post those results as soon as the service manager prints it out.

Bike is a 2004 FJR/ABS
39,000 miles

June 2nd, 2006, 10:19 AM
****! That looks like buildup from backfiring or less-than-clean air from the airbox....:wtf:

Fuel shouldn't even be getting upstream from the injectors, should it???

June 2nd, 2006, 10:54 AM
There is always some reversion in an engine and I think Dewayne had a valve problem on this bike also. Might be what helped lead to this build up.

I agree, that looks excessive. I'd hope this wouldn't be the case with fuel injected bikes, especially the FJR which I have not heard of many problems with. Certainly not as many as Dewayne seems to be having. :eek:

June 2nd, 2006, 03:13 PM
Dang! Those look pretty gruesome. My deceased 2003 FJR had 32,000 miles and had zero build-up. It did have the dreaded valve-tick problem, but I crunched it before having that fixed. I'll go out on a limb here and make a guess or two.
Could it be from salt-air and sandy environment? You been taking it to the beach to pick up spring breakers?

Or could it be from not twisting the throttle frequently enough to keep the inards clean?

June 2nd, 2006, 11:25 PM
Does not using Premium really have that much of an effect on the bike. IF so does it matter on a Carbureted bike?

June 3rd, 2006, 11:51 AM
If the compression ratio is stock, go with the manufacturer's recommendation.;)

Actually, using a higher octane fuel than necessary can hurt performance.

Brad Felmey
June 4th, 2006, 01:11 PM
using a higher octane fuel than necessary can hurt performance.


Travis H
June 4th, 2006, 01:44 PM
On the other hand, if the manufacturer recommends 93 plus octane(and I believe that they do on the fjr) there is probably a reason for it. Predetonation can ruin an engine just as easily as any thing else. Take the warnings seriously about using less than the recommended octane level on your fuel.(jmop)

June 4th, 2006, 01:58 PM
87 is all thats called for in the owner's manual. Actually I have to go with the oil blowby theory, though this thing has never used oil. Maybe it just doesn't take much. Rode about 150 miles on today's SMR and the bike still hauls a**. Wheeee

June 4th, 2006, 03:56 PM
On the other hand, if the manufacturer recommends 93 plus octane...there is probably a reason for it.

That's what I was saying. I guess my poor grammar just didn't make it clear.....;)